Cylinder head assembly



Aug. 15 1950 w. M. CARRAWAY 2,519,110

CYLINDER HEAD ASSEMBLY Filed Feb. 17, 1949 2,] W0 urn Km; mum/ 7 M. 602mm; Y.

Patented Aug. 15, 1950 CYLINBEE HEAD ssamese M; Carraway,x Norfblk Var. Aiisiitatfenretruery 17, 1949, Serial No. 76,919

i The: present; invention; reiatesitori niproveme aitsi V etof'ore; air-cooled;gasolinecngmesz?of; this type which have been: used;:omiiiaichixrery and l'or'" equipment as: mowers: like; have fares re longrserzvice due mbecomingfrovere iiifig outz Itil-iasibeertdiscovered;

and experience at'iithis- '1 here-ares; grass; and flor" other" 1 and J or'around With the conventional type oiacylind'er head;

in order to clear the air. ducts ofthisriloreign material it is necessary to dismantfepart of the gnmaterial as possible; v as proverr very unsatisfactory imracticaible' be cause of the complicated dismantling and reassembling of the engine and its attachments. Moreover, this clogging of the air ducts invariably takes place when the en ine is bein used in the field remote from a workshop and tool kit. As a result, few operators clean out theair ducts irequently and promptly, and, therefore, many en'- gines are burned out as a direct result of overheating caused by these clogged air ducts.

It is an object of the present invention to overcome this difficulty by providing an improved cylinder head having a cap or cover which can quickly and easily be removed without the use of tools, thus affording easy access to the air ducts and still be readily replaceable while the engine is in actual operation.

A further object of the present invention is to provide an improved cylinder head for eliminating this cause of overheating which can be easily substituted for the conventional type of cylinder head on engines now in service. V

Another object of the present invention is to provide an improved cylinder head assembly of this character which is inexpensive to manufac- "under hea assembiies'- and: especialiy for;

type ngirrehas. been; caused by are.

engines of prior artiis' veny suesssembly to enable the 'operator to ar 7 ntake and air exhaust'd' ts with a re, rnilar obiect bydiggirig'h t the tha'foregoingzand: other objects in: view, thdllvfltiOfLWiiill? b'e hereinafter more fiul-ly dew scribed: and: more particularly pointed; out: moths:

appended: claims;

'Inithe drawings in: which the same parts; aredenntedi by'tne same reference numerals through" out th'e several? views;

Figure 1 is a to 'iplan: view at the improved: cylinderlieadzassembly,

Figure is: a vertical cross sectional" view-ori theiirie' of Figure I,

Figure; a is a..- View similar to mat er Figure 1. withi the cap: or removed, and

Figure Pl-is a; bottom plan view of the or cover.

Referring morezparticul'arly' to the drawings, lmdesignates ai'cyliimde'f head three. ofl'l'iosse'sr Ni aridi- I12,- t3 and 4 and I 5 and and; whose He The cylinder head "I has bolt holesxlii which extend. th rouglithe bosses-- It ta l1- and*a;zieadapted to" receive the asset tap bolts for attaching the cylinder nead tothe '24 in a cap or cover 25. The stud bolt proiects beyond the upper surface of the cap 25 and receives a wing nut 26 for attaching the cap 25 to the cylinder head l0. At one end the cap 25 has a rib 21 which is received by a correspondingly shaped depressed seat 28 formed in the cylinder head ID. The edge of the opposite end of the cap 25 has two spaced apart semi-circular notches 29 and 30 which embrace and interlock, respectively, with the bosses H and I2 of the cylinder head Ill.

The cap or cover 25 has a downwardly sloping end wall 3! and downwardly sloping side walls 32 and 33 and is of hollow formation so as to accommodate the ribs l9 and boss 22 of the cylinder head HI. The side wall 33 is cut away as at 34 to provide an extension or car 35 which overlies the receding portion 36 of the cylinder head It).

In the use of the device, the conventional cyl-- inder head of an engine already in service is removed and the improved cylinder head I is secured to the standard engine block by means of the usual tap bolts which are received by the openings 18 in the cylinder head 10. The cover 25 is then placed upon the cylinder head [0 with the stud bolt 23 extending through the opening 24 in the cover 25 and projecting beyond the upper surface thereof. The wing nut 28 is then placed upon the projecting end of the stud bolt 23 and screwed home. When the cover 25 is thus positioned upon the cylinder head the rib 21 of the cover is received by the depressed seat 28 of the cylinder head [0 and the notches 29 and 30 embrace and interlock, respectively, With the bosses H and 12 of the cylinder head [0 so cylinder head.

After the engine has been in service long enough for trash and the like to have accumu lated in the air ducts 20, the cover 25 can be removed simply by unscrewing the wing nut by hand and lifting the cover 25 from the cylinder head. This removal of the cover can be efiected without the use of tools and can be accomplished while the engine is in service in the field remote from a workshop or tool kit. The removal of the cover 25 exposes the air ducts 20 and makes them available to the operator for quickly and thoroughly cleaning out the trash-and the like which may have accumulated therein.

Due to the ease and speed with which the cover may be removed and the air ducts cleaned out, the operator is encouraged'to frequently remove the foreign material from the air ducts so that overheating and burning out Of the engine is prevented. Consequently, the efiiciency and the life of the engine is greatly increased.

It is obvious that various changes and modifications may be made in the details of construction and design of the above specifically described ceive tap bolts for securing the cylinder head to z the engine block and a depressed seat at the op- 4 posite end of the cylinder head in opposed relation to the space between said bosses, a threaded stud bolt supported by the cylinder head at substantially the center thereof, a cover for detachable mounting on the cylinder head over the air ducts and having an opening therein through which the stud bolt passes and projects, and a wing nut received by the projecting portion of the stud bolt for detachably securing the cover in position upon the cylinder head, said cover having a pair of spaced apart substantially semicircular notches for interlocking engagement with the bosses of the cylinder head, and having a rib for reception by said seat.

2. An improved cylinder head assembly comprising a cylinder head having air ducts therein and a pair-f spaced apart apertured bosses adjacent one end of the cylinder head adapted to receive tap bolts for securing the cylinder head to air ducts and having an opening thereinthrough which the stud bolt passes and projects, and a wing nut received'by the projecting portion of the stud bolt for detachably securing the cover in position' upon the cylinder head, said cover having a pair of spaced apart substantially semicircular notches on one edge thereof for interlocking engagem-ent with the bosses of the cylinder head,

and having, a rib on its opposite edge for reception by said seat for centering said cover with re- 'spect to said stud bolt and said spaced apart' bosses, whereby said stud bolt will be received by said opening in the cover and said notches'will receive said spaced" apart bosses.

* WILLIAM M. CARRAWAY.

1 REFERENCES CITED The following references are of record in the file'of thispatent:

UNITED STATES PATENTS I Number Name Date 962,233 Miller June 21, 1910- 1,342,976 Thompson a June 8, 1920 2,217,002 Burbank Oct. 8, 1940 Neuland Dec. 22, 1942 

